1.5 mm thick shim stock .. that is the difference between the 2 , rolling it around the post = 3mm ,
the diameter difference in question..
Vernier Micrometer caliper is useful in measuring these sort of thin materials..
wall thickness of a tube is a radial measurement .. 2r=D

1.5 mm thick shim stock .. that is the difference between the 2 , rolling it around the post = 3mm ,
the diameter difference in question..
Vernier Micrometer caliper is useful in measuring these sort of thin materials..
wall thickness of a tube is a radial measurement .. 2r=D

Thanks fietbob for the lightening quick response and the helpful insights, I read that aluminum is the best matrial to use for this. Any advice on how to get the shim formed?

why don't you just buy a 31.6 seatpost? They exist, thomson et al. 28.6 is also another unusual size.

Pre-manufactured shim will take a 31.6 to a much more common 27.2 size. Do that.

Thats true that regular post exist, but suspension seat posts in a 31.6 dia. don't(with the possible exception of an awful looking device called a thud buster but it still might haved to be shimmed up). I want a suspension seat post that's as close the the diameter as possible. When I purchased my bike I was naive and thought suspension seat posts were availble in all sizes. p.s. a 27.2 looks like a tooth pick when coming out of a 31.6 tube.